Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 24, Pages 5562-5565Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.5562
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Nearly 3 orders of magnitude enhancement in the Hall coefficient is observed in Cu-x -(SiO2)(1-x) granular films. This large enhancement of the Hall coefficient not only is significantly larger than the prediction of the classical percolation theory, but also occurs at a metal concentration identified to be the quantum percolation threshold. Measurements of the electron dephasing length and magnetoresistance, plus the TEM characterization of microstructures, yield a physical picture consistent with the mechanism of the local quantum interference effect.
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